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Malm |
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malm [mäm]
(geology) Malm [mäm] (geology) The Upper Jurassic geologic series, above Dogger and below Cretaceous. malm 1. Earth containing a considerable quantity of chalk in fine particles; a calcareous loam. 2. A malm brick. Malm (the name “malm” is given by English stonemasons to soft clayey oolite limestones), in geology, the uppermost division of the Jurassic system. The term was proposed by the German geologist A. Oppel in 1856-58. The Malm is subdivided into four stages: Callovian, Oxfordian, Kimmeridgian, and Upper Volgian (the last is called the Portlandian or Tithonian in different countries). A number of West European geologists classify the Callovian in the Middle Jurassic. The accumulation of marine deposits in the Malm was associated with a vast transgression. Limestone and flysch strata are especially typical of the Malm. In the USSR it is extensively developed on the Eastern European Platform, in Western Siberia, the Caucasus, the Crimea, and the Pamirs. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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